Cone theorem and Mori hyperbolicity
Algebraic Geometry
2022-12-27 v3
Abstract
We discuss the cone theorem for quasi-log schemes and the Mori hyperbolicity. In particular, we establish that the log canonical divisor of a Mori hyperbolic projective normal pair is nef if it is nef when restricted to the non-lc locus. This answers Svaldi's question completely. We also treat the uniruledness of the degenerate locus of an extremal contraction morphism for quasi-log schemes. Furthermore, we prove that every fiber of a relative quasi-log Fano scheme is rationally chain connected modulo the non-qlc locus.
Cite
@article{arxiv.2102.11986,
title = {Cone theorem and Mori hyperbolicity},
author = {Osamu Fujino},
journal= {arXiv preprint arXiv:2102.11986},
year = {2022}
}
Comments
46 pages, v2: minor modifications, v3: revisions following referees' comments and suggestions